Update requirements.txt

[rahulkumaran]

Fixes #623

Checklist

• I have made a material change to the repo (functionality, testing, spelling, grammar)
• I have read the [Contribution Guide] and my PR follows them.

Short description of what this PR does:

• Currently, the versions in requirements.txt are not up to date
• This PR upgrades the versions of the python modules to the latest versions

If you have questions, please send an email to SendGrid, or file a GitHub Issue in this repository.

[rahulkumaran]

@thinkingserious this is a PR that's the same as #624 . Had to close the previous one because a lot of conflicts were arising. Anyway, this is good to go now! 😄
Thanks!

[codecov]

Codecov Report

Merging #630 into v4 will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##               v4     #630   +/-   ##
=======================================
  Coverage   84.34%   84.34%           
=======================================
  Files          37       37           
  Lines         952      952           
  Branches      105      105           
=======================================
  Hits          803      803           
  Misses         92       92           
  Partials       57       57

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[thinkingserious]

Hello @rahulkumaran,

Thanks again for the PR!

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Team SendGrid DX

[thinkingserious]

Hello @rahulkumaran,

Thanks again for the PR!

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